JPH0942506A - Emergency valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost of a facility by allowing one emergency valve to have functions of two emergency shut down valves and one emergency reliet valve while using a standard cylindrical pipe and preventing adhesion of scale and the like. SOLUTION: A valve body 20 for bypass, comprising a stationary plate 14 with a circulation hole and a movable plate 18 opening and closing the circulation hole, is attached to a valve rod 13 provided in a cylindrical valve box 12 with both ends of the axial direction blocked. The inside of the valve box 12 is partitioned into two parts of an inflow room 15 and an outflow room 16, and cylindrical inlet parts 21, 23 and outlet parts 22, 24 are provided on the periphery walls of the respective rooms 15, 16. Then, an inflow side valve body 27 and an outflow side valve body 29 which open and close between the inlet parts 21, 23 and the outlet parts 22, 24 are connected with the valve rod 13.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an emergency valve, more specifically,
It is installed between the main water storage and the main water storage section, such as an earthquake-resistant water storage tank or distribution reservoir, which is provided for securing drinking water in the event of an emergency (emergency) such as an earthquake. The present invention relates to an emergency valve used for shutting off the inflow and outflow pipes and opening the bypass pipe in an emergency.

[0002]

2. Description of the Related Art FIG. 7 shows an outline of piping equipment for an earthquake-resistant water storage tank equipped with an emergency valve. In FIG. 7, 1 is a main pipe with a main valve 2 interposed, 3 is a seismic resistant water tank, 4 is an upstream side of the main valve 2, and is connected between the main pipe 1 and the seismic resistant water tank 3. Inflow pipes 5 are on the downstream side of the main valve 2 and the main pipe 1 is provided.
An outflow pipe connected between the seismic resistant water storage tank 3 and the seismic resistant water storage tank 3, and a valve storage section 6 disposed between the main pipe 1 and the seismic resistant water storage tank 3.

In the valve storage section 6, the inflow pipe 4 is provided.
An emergency shutoff valve 7 as a normally open inflow valve is installed in the above, and an emergency shutoff valve 8 as a normally open outflow valve is installed in the outflow pipe 5. Further, in the valve storage section 6, a bypass pipe 9 is connected between the upstream side of the emergency shutoff valve 7 in the inflow pipe 4 and the downstream side of the emergency shutoff valve 8 in the outflow pipe 5. An emergency opening valve 10 as a normally closed bypass valve is interposed in the pipe 9.

The emergency shutoff valves 7 and 8 which are emergency valves are constructed, for example, as shown in FIG. In FIG. 8, reference numeral 101 denotes a valve body, and a valve body 103 is mounted in the valve body 101 via a valve rod 102 so as to be rotatable and openable. A valve rod 102 protruding through the plate-shaped bracket 104 fixedly supported to the outside of the valve body 101 to the outside.
A base end of a weight lever 105, which is integrally rotatable around the valve rod 102 as an axis, is fixed to one end of the weight lever 105, and a weight 106 is fixed to the tip of the weight lever 105 to close the dead weight closing mechanism. It constitutes 107. 108
Is a link mechanism having a fixed arm 108A for holding the fixed pin 105A of the weight lever 105, and
03 is a valve open holding mechanism that holds 03 in a fully open position. Numeral 109 is a stopper pin which is projected by the force of the spring 110 and restrains and holds the movement of the link mechanism 108. The stopper pin 109 is retracted by a solenoid 111 which operates upon receiving an emergency cutoff signal to restrain the link mechanism 108. The holding state is released, and together with the spring 110, the solenoid 111, etc., a valve open holding release mechanism 112 is configured.

Reference numeral 113 denotes a manual operation mechanism, which comprises a rotary operation handle 114, a reduction gear unit 115 and a rotary clutch 116 interposed between the valve rod 102 and the reduction gear unit 115 for switching between a power transmission state and a disengaged state. The valve body 103 is returned from the closed position to the fully opened position against the weight of the weight 106.

In the emergency shutoff valves 7 and 8 having the above structure,
When the solenoid 111 is activated in response to the emergency cutoff signal and the restraint of the movement of the link mechanism 108 is released, the weight 1
06 is gravity-dropped by its own weight, and the torque at this time is transmitted to the valve rod 102 via the weight lever 105, and when the weight 106 reaches a predetermined position, the valve body 1
03 is automatically closed. When the handle 114 is rotated at the closed position of the valve body 103, the rotational force is transmitted to the valve rod 102 via the reduction gear device 115 and the rotary clutch 116, and the weight 10 is moved.
The valve body 103 is returned to the fully open position against the weight of 6.
Note that the emergency opening valve 10 as the bypass valve also has a configuration in which the open / close state is opposite to that of the emergency shutoff valves 7 and 8, and thus a detailed description thereof will be omitted.

In FIG. 7, the water flowing through the main pipe 1 at normal times flows into the seismic resistant water storage tank 3 through the inflow pipe 4 in which the normally open emergency shutoff valve 7 is interposed, and the seismic resistant water storage tank 3 is provided. Is returned to the main pipe 1 through the outflow pipe 5 in which the normally open emergency shutoff valve 8 is interposed, whereby a constant amount of water is always stored in the seismic resistant water storage tank 3. When a disaster such as an earthquake occurs, the emergency shutoff valves 7 and 8 of the inflow pipe 4 and the outflow pipe 5 are closed to shut off the water flow through the seismic storage tank 3, while the bypass pipe 9 is normally operated. Since the closed emergency opening valve 10 is opened, the water from the main pipe 1 is returned to the main pipe 1 through the bypass pipe 9, whereby the water stored in the earthquake-resistant water storage tank 3 is used as drinking water. Reserved.

[0008]

Since the conventional emergency valve having the above-mentioned structure is opened or closed by the operation of one valve body, the above-mentioned piping facility for the seismic storage tank. In this case, the three emergency valves 7, 8 and 10 must be installed and used as one set corresponding to the inflow valve, the outflow valve and the bypass valve, respectively, which inevitably increases the cost of the entire equipment.

Further, the inflow pipe 4 and the outflow pipe 5 are connected to a special T
It is also proposed that the inflow valve, the outflow valve, and the bypass valve are connected by a letter pipe so that the single emergency valve 201 functions as shown in FIG. And a tube with a semicircular cross section must be used as the outflow tube 203. Such a semi-circular tube 202,
No. 203 has a drawback in that the flow of water is unlikely to be rectified like a cylindrical pipe, and water stains and dust are likely to collect, particularly in the corners of the pipe.

Therefore, the invention according to claim 1 of the present invention has been made in view of the above-mentioned actual circumstances, and the normally open inflow and outflow valves and the normally closed valves can be used while making the best use of the pipe structure using the standard cylindrical pipe. It is an object of the present invention to provide an emergency valve that has each function of a bypass valve and can reduce costs.

In addition to the object of the invention as set forth in claim 1, the invention as set forth in claim 2 makes it possible to reduce the return operation force from the emergency shutoff state while making the whole compact. The purpose is to provide a valve.

[0012]

In order to achieve the above-mentioned object, an emergency valve according to a first aspect of the present invention comprises a cylindrical valve box with both axial openings closed, and A valve rod that is disposed on the axial center of the valve box and that is rotatably supported by penetrating the valve box, and has a flow hole that penetrates in the axial direction. A circular fixed plate arranged in the valve box in a state of being divided into an inflow side chamber and an outflow side chamber, and a fixed plate superposed on the fixed plate and fixed to the valve rod, and at the normal time, the distribution A movable plate constrained and held at a position for closing the hole to form a bypass valve body by the fixed plate, a cylindrical inlet portion formed on the peripheral walls of the inflow side chamber and the outflow side chamber, and An outlet and a flow path between the inlet and the outlet of the inflow-side chamber, which is connected to the valve rod in normal times. The inflow side valve body held in the open position and the outflow connected to the valve rod and normally held in the position to open the flow path between the inlet and outlet of the outflow side chamber. The side valve body, the weight lever fixed to the valve rod and the weight attached to the tip of the weight lever, and the torque due to the gravity drop of the weight to the valve rod when the restraint states are released in an emergency. The bypass valve body is transmitted to open the bypass valve body, and a self-weight opening / closing mechanism for closing the inflow side valve body and the outflow side valve body respectively is provided. While the body is restrained and held at the closed position, the inflow side valve body and the outflow side valve body are restrained and held at the open position. Torque due to gravity drop Since the bypass valve element is transmitted to the valve rod and the bypass valve element is opened, the inflow side valve element and the outflow side valve element are closed, the water flowing into the inflow side chamber flows to the outflow side chamber. , Such as returning from the outlet of this chamber to the main side, the bypass valve element acts as an emergency opening valve, while the upstream side and downstream side valve elements respectively shut off in the inflow pipe and the outflow pipe. It will act as a valve. Therefore, it is possible to share the parts as a valve and reduce the cost, and since the inlet and the outlet are cylindrical, a standard cylindrical pipe can be used as it is, and the water inside the pipe can be used. The flow is kept rectified to prevent water stains from adhering. Also,
According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the inlet portion and the outlet portion of each chamber are formed so as to face each other in a radial direction along a horizontal plane orthogonal to the axis of the valve box, In each of the chambers, the inflow side and outflow side valve bodies are fixed to the tips of the arms that are fixed to the valve rods and extend outward in the radial direction, and in an emergency, the inflow side valve body is used to enter the inlet side of the inflow side chamber. Alternatively, the outlet section is closed, and the outlet side valve element is configured to close the inlet section or the outlet section of the chamber on the outflow side. The angle of rotation of the valve stem can be adjusted by mounting it on the tip of an arm fixed to the valve stem and opening and closing the inlet and outlet parts of the chambers on the inflow side and the outflow side that are formed facing each other in the radial direction. However, compared with the butterfly valve that constitutes a normal emergency valve, Since it becomes smaller (less than 90 degrees), the overall size can be reduced, and the torque against the fluid pressure when water is stopped can be small, so that the weight lever can be shortened or the weight can be reduced to reduce the return operation force. It is possible.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of piping equipment for an earthquake-resistant water storage tank to which an emergency valve according to an embodiment of the present invention is applied. In FIG. 1, the same parts as those of the conventional example shown in FIG. , The same reference numerals are given and detailed description thereof is omitted. In FIG. 1, reference numeral 11 is an emergency valve provided in the valve storage section 6, and a specific configuration of the emergency valve 11 is shown in FIG.

In FIG. 2, reference numeral 12 is a valve box, which comprises a cylindrical body 12A and covers 12B and 12C for closing the openings at both axial ends of the body 12A. A valve rod 13 arranged axially and penetrating the valve box 12 is rotatably supported. Reference numeral 14 denotes a circular fixing plate fixed to the valve box 1 so as to divide the inside of the valve box 12 into a chamber 15 on the inflow side and a chamber 16 on the outflow side in the axial direction thereof. 3, a plurality of flow holes 17 are formed around the valve rod 13 as shown in FIG. Reference numeral 18 denotes a circular movable plate fixed to the valve rod 13 in a superposed state on the fixed plate 14, and the movable plate 18 includes:
As shown in FIG. 3, a plurality of flow holes 19 are formed in the valve rod 1 at positions displaced from the flow hole 17 by a predetermined rotation angle.
It is formed around 3. The movable plate 18 blocks the two chambers 15 and 16 in the normal state by the fixed plate 14, and in an emergency, the displacement of the rotation angle causes the flow hole 19 to coincide with the flow hole 17 so that the two chambers are closed. A normally closed bypass valve body 20 for opening the valves 15 and 16 is configured. Here, the movable plate 18 is not limited to a circular shape and may have any shape as long as it can open and close the flow hole 17 on the fixed plate 14 side.

On the peripheral wall of the inflow side chamber 15, a cylindrical inlet portion 2 is formed in a radial direction along a horizontal plane orthogonal to the axis.
1 and an outlet 22 are formed so as to face each other, and a cylindrical inlet 23 and an outlet 2 are also formed on the circumferential wall of the inflow side chamber 16 in a radial direction along a horizontal plane orthogonal to the axis.
4 are formed to face each other in the radial direction. Reference numerals 25 and 26 are valve seats provided on the inner edges of the outlet 22 and the inlet 23.

Reference numeral 27 is a valve body which is normally held in a position where the flow path of the inflow chamber 15 is openably closed, and is fixed to the valve rod 13 and extends radially outward. It is attached to the tip of the arm 28, and as shown in FIG. 5, the outlet portion 22 is closed from the inside by the displacement corresponding to the rotation angle of the valve rod 13 in an emergency. Reference numeral 29 denotes a valve body which is normally held in a position where the flow path of the outflow side chamber 16 is openably closed. For example, the arm 30 is fixed to the valve rod 13 and extends radially outward. It is attached to the tip, and in an emergency, the inlet portion 23 is closed from the inside by a displacement corresponding to the rotation angle of the valve rod 13. As shown in FIG. 6, the valve seats 25 and 26 are configured such that their thickness gradually increases as the valve body 27 (29) in the fully open position reaches the fully closed position (t2> t).
1).

A base end of a weight lever 31 which is integrally rotatable around the valve rod 13 as an axis is fixed to one end of the valve rod 13, and the weight lever 31 and the weight fixed to the tip end thereof are fixed. A self-weight opening / closing mechanism 33 is configured with 32. This self-weight open / close mechanism 33 transmits the gravity of the weight 32 to the valve rod 13 in an emergency, and the movable plate 1 is restrained and held in the closed position by the torque generated by the gravity.
8 is urged to rotate to the fully open position (FIG. 4), while the valve elements 27 and 29, which are constrained to the open position, are urged to rotate to the closed position. The state in which the valve body 20 is held in the closed position and the state in which the valve bodies 27 and 29 are held in the open position is released by well-known means using a solenoid (not shown).

Reference numeral 34 is a manual operation mechanism mounted on the other end side of the valve rod 13, and the manual operation mechanism 34 includes a rotary operation handle 35, a reduction gear device 36 and the valve rod 13.
And a reduction gear device 36, and includes a rotary clutch 37 that switches between a power transmission state and a disengaged state.
The valve body 20 is returned to the closed position against the weight of the weight 32, while the valve bodies 27 and 29 are returned to the fully open position.

A drain discharge port 38 as shown in FIG. 5 is formed in the bottom of the valve box 12, and an open / close valve 39 is attached to the drain discharge port 38. Since the drain discharge port 38 is provided in the valve box 12, it is not necessary to provide the drain discharge part in the inflow pipe 4 or the like, and the piping construction is simplified.

When the emergency valve 11 constructed as described above is used in the seismic storage tank piping equipment of FIG. 1, the main pipe 1 side of the inflow pipe 4 is connected to the inlet portion 21 of the inflow chamber 15. Then, the seismic resistant water storage tank 3 side of the inflow pipe 4 is connected to the outlet portion 22 of the inflow side chamber 15. Further, the seismic resistant water storage tank 3 side of the outflow pipe 5 is connected to the inlet portion 23 of the outflow side chamber 16, and the main pipe 1 side of the outflow pipe 5 is connected to the outlet portion 24 of the flow circulation side chamber 16.

In normal times, the movable plate 18 of the bypass valve body 20 is restrained and held in the closed position against the self-weight of the weight 32, and the movable plate 1 with respect to the flow hole 17 of the fixed plate 14 is held.
As shown in FIG. 3, the circulation holes 19 of the valve 8 are displaced by the rotation angle of the valve rod 13, and therefore the inflow side chamber 15 and the outflow side chamber 16
And are in the cutoff state. On the other hand, the valve body 27 in the inflow side chamber 15 and the valve body 29 in the outflow side chamber 16 are restrained and held at the fully open position shown by the solid line in FIG. 5, respectively.
Flow path in the chamber 15 on the inflow side, that is, the inlet portion 21 and the outlet portion 2
2 is in communication with each other, and the flow path in the chamber 16 on the outflow side, that is, the inlet portion 23 and the outlet portion 24 are in communication with each other. Therefore, in this normal condition, the water from the main pipe 1 flows through the inflow pipe 4 from the inlet portion 21 to the inflow side chamber 1
5 through the outlet portion 22 into the seismic storage tank 3,
The water from the seismic-resistant water storage tank 3 passes from the inlet portion 23 through the outflow-side chamber 16 and is returned from the outlet portion 24 to the main pipe 1 by the outflow pipe 5. A large amount of water is stored.

When a disaster such as an earthquake occurs, the valve body 20
Since the restrained holding state of the closed position and the open position of the valve bodies 27 and 29 is released, the weight 32 falls by gravity due to its own weight, and the torque due to the gravity drop of the weight 32 passes through the weight lever 31. Is transmitted to the valve rod 13. Therefore, when the weight 32 reaches a predetermined position, the movable plate 18 of the valve body 20 rotates by the rotation angle of the valve rod 13, and the flow hole 19 on the movable plate 18 side is fixed, as shown in FIG. Since it matches the circulation hole 17 on the plate 14 side,
The inflow side chamber 15 and the outflow side chamber 16 are opened.
At this time, the valve body 27 also rotates from the open position in FIG. 5 via the arm 28 to close the outlet portion 22 as shown by the chain line, while the valve body 29 also rotates via the arm 30. To close the entrance 23. Therefore, the inlet 21 and the outlet 22 of the inflow side chamber 15 and the inlet 23 and the outlet 24 of the outflow side chamber 16 are blocked. Since the thicknesses of the valve seats 25, 26 corresponding to the valve bodies 27, 29 increase toward the fully closed position side, the valve seats 25, 26 of the valve bodies 27, 29 at the fully closed position with respect to the valve seats 25, 26. Adhesion is enhanced and water resistance is improved.

When the disaster occurs, the valve body 20 is opened and the valve bodies 27 and 29 are closed.
The water flowing into the chamber 15 on the inflow side reaches the chamber 16 on the outflow side, from which the water flows through the outflow port 24, the outflow pipe 5, and the main pipe 1.
Will be returned. Thereby, the water stored in the earthquake-resistant water storage tank 3 is secured as drinking water. Thus, since the valve body 20 functions as an emergency opening valve for bypass between the inflow pipe 4 and the outflow pipe 5, and the valve bodies 27 and 29 function as emergency shutoff valves as inflow and outflow valves, respectively. ,
Instead of the conventional two emergency shutoff valves and one emergency open valve, one emergency valve 11 can be used, and the number of parts can be reduced and the cost can be drastically reduced. Further, as the inflow pipe 4 and the outflow pipe 5 can use standard cylindrical pipes, the flow of water in the inflow pipe 4 and the outflow pipe 5 is rectified, and water stains and dust are less likely to adhere to the inside of the pipe.

By the way, the emergency shutoff valves 6 and 7 shown in FIG.
Since the emergency release valve 10 is a butterfly valve, the valve stem 1
The rotation angle of 02 is 90 °. Therefore, as shown in FIG. 10, the distance H by which the weight 106 is displaced becomes relatively large, but in the emergency valve 11 according to the embodiment of the present invention, The inlet portions 21 (23) and the outlet portions 22 (24) of the chambers 15 and 16 are provided to face each other in the radial direction along a horizontal plane orthogonal to the axial direction, and the inflow side and outflow side valve elements 27 and 29 are provided. Arm 28 (29) fixed to the valve rod 13
Since the inlet portion 21 (23) or the outlet portion 22 (24) is opened and closed by rotating via the valve, the rotation angle of the valve rod 13 is smaller than that of the butterfly valve, and the whole can be made compact accordingly. Further, since the torque may be small against the fluid pressure at the closed position, the operation force for returning the weight 32 can be reduced.

[0025]

As described above, according to the first aspect of the present invention, the inside of the cylindrical valve box is composed of the fixed plate having the flow hole and the movable plate for opening and closing the flow hole. The normally closed bypass valve body divides the chamber into an inflow side chamber and an outflow side chamber, and the normally open inflow side and outflow side valves are provided between the cylindrical inlet and outlet of each chamber. Since it is designed to be opened and closed by the body, one emergency valve has the function of two emergency shutoff valves and one
In order to have the function of the emergency release valve of the stand,
It can reduce the overall cost when applied to seismic resistant water tank piping equipment, and since the inlet and outlet are cylindrical, connect the conventional standard cylindrical inflow and outflow pipes as they are. As a result, the flow of water flowing in the pipe is rectified and the adhesion of scales can be prevented.

According to the invention as set forth in claim 2, in addition to the effect of the invention as set forth in claim 1, the inlet portion and the outlet portion formed to face each other in the radial direction along a horizontal plane orthogonal to the axis of the valve box. The part can be opened and closed by the inflow-side and outflow-side valve bodies attached to the tips of the arms that extend radially outward from the valve rod, so that the water stoppage by the above-mentioned valve bodies is measured along the horizontal plane. The valve rod rotation angle is smaller than that of the butterfly valve, the operating distance of the weight is shorter, the overall size can be reduced, and the torque against the fluid pressure when water is stopped is small. Since it is good, it is possible to reduce the return operation force of the weight.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of piping equipment for an earthquake-resistant water storage tank to which an emergency valve according to an embodiment of the present invention is applied.

FIG. 2 is a partially cutaway plan view showing the emergency valve.

FIG. 3 is a longitudinal sectional view showing a bypass valve body of the emergency valve in a closed state.

FIG. 4 is a vertical cross-sectional view showing the bypass valve body of the emergency valve in an open state.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a vertical cross-sectional view showing a valve seat of an inflow and outflow valve body.

FIG. 7 is a configuration diagram showing an outline of piping equipment for a seismic resistant water storage tank to which a conventional emergency valve is applied.

FIG. 8 is a perspective view showing a conventional emergency shutoff valve.

FIG. 9 is a perspective view showing a sectional shape of an inflow pipe and an outflow pipe in a piping facility in which a single emergency valve substitutes for the conventional inflow valve, outflow valve, and bypass valve.

FIG. 10 is a configuration diagram showing an outline of a butterfly valve that constitutes a conventional emergency shutoff (open) valve.

[Explanation of symbols]

 12 valve box 13 valve rod 14 fixed plate 15 inflow side chamber 16 outflow side chamber 17 flow hole 18 movable plate 20 normally closed bypass valve 21, 23 inlet part 22, 24 outlet part 27 inlet side valve body 28, 30 Arm 29 Outflow side valve body 31 Weight lever 32 Weight 33 Self-weight open / close mechanism

Claims (2)

[Claims] 1. A cylindrical valve box with both axial openings closed, and a valve rod disposed on the axis of the valve box and rotatably supported through the valve box. A circular fixing plate having a through hole penetrating in the axial direction and arranged in the valve box in such a manner that the inside of the valve box is divided into an inflow side chamber and an outflow side chamber in the axial direction; A fixed plate, which is fixed to the valve rod in a superposed state in a superposed state, and is normally restrained and held at a position for closing the flow hole to form a bypass valve body by the fixed plate; Side inlet and outlet formed on the peripheral wall of the outlet side chamber and the cylindrical inlet and outlet, respectively, and the flow between the inlet and outlet of the inlet side chamber connected to the valve rod in normal times. The inflow side valve body, which is held in a position to open the passage, is connected to the valve rod, and in the normal state, it is connected to the outflow side chamber. Outflow side valve body restrained and held at a position to open the flow path between the inlet part and the outlet part, a weight lever fixed to the valve rod and a weight attached to the tip of the weight lever, and an emergency When the above-mentioned restraint states are released, the weight open / close mechanism for transmitting the torque due to the gravity drop of the weight to the valve rod to open the bypass valve body and closing the inflow side and outflow side valve bodies, respectively. An emergency valve characterized by having and. 2. The inlet portion and the outlet portion of each chamber are formed so as to face each other in the radial direction along a horizontal plane orthogonal to the axis of the valve box, and are fixed to the valve rod in each chamber to be radially outward. The inflow side and outflow side valve bodies are respectively fixed to the tips of the arms extending to, and the inlet side or outlet side of the inflow side chamber is closed by the inflow side valve body in an emergency,
2. The emergency valve according to claim 1, wherein the outflow-side valve body is configured to close an inlet portion or an outlet portion of the outflow-side chamber.